Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a46408c873df7b0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 10:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ca83ae9eaadce5fa558b3c9909d8905 SHA-1: 50b33376f588c99e9af3de561d02ec12e215b190 SHA-256: 3a46408c873df7b08a7deff2f016af40bc6d208feee79678964d9c6e78041b6c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting files. The presence of a 'SE_CALLBACK_LURE' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=what+is+the+synoptic+problem+pdf PDF link annotation
    • https://pasarantogelsatu.com/contents//files/64567613627.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe413d1e0---lamuwovirujumazofumunofow.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9e3bf2cf---megaliweta.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/49035192323.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/ladupofikarexabida.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/946538258.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/55300190622.pdfIn PDF document text
    • https://cape-electronics.com/media/file/7980183841.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/figuguvafafuxot.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d93caeadc---13369697409.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/043764404dcae74aab3985bd380b44e4/lomomubalepokolanigam.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dd642ee2ef182cf1bc601e26345ab38f/pizunudenamamefekuzag.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/56b7c67d5da87b52b758c453562fc588/49536245641.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30b1e4f51---davitetowubelikuvowax.pdfIn PDF document text
    • https://morabia.fi/images/file/sasowaseloboj.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/42268823696.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160744d4b76ac2---39169550416.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d13d165de9b443e7641b05c64906841f/vidaru.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/62896681488.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210527231059.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a4fcee2a48ff27aebd325d9d805b89e8/xugozowatobamozu.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/54020479424.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/kuwafus.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3fb2301ef---puzalefevaviba.pdfPDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ff6b2f18f1c88b025a521654696f94b9/raperegajo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 16452 bytes
SHA-256: 1b03d6d5e167f6a82c272c3c8ce30247a6a59bcf171b62bfefb6a461b4bc66ca
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 11132 bytes
SHA-256: aab9d39a05cb5c241e2b5dca00b5c4eabe98f34fc2a23816525359a0793bdeb8
font_02_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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